Awesome, it would never have occured to me to cut a chassis out of pcb, I have a contact with a laser cutter, maybe just maybe i might go in for that, I love the second design on that page, with the suspension on the rear axel, although i cant think why suspension is really useful ?

would it help the traction round corners? I have got my GYRO working , or at least I have numbers changing in the serial print when i move it, if i combine that with some mosfet to control the motor then hey presto, I would have the workings of an arduino car, and if the chassis is made of PCB then it would probly work for the heatsink on the mosfet,